The final go ahead, eventually supported by the Foreign Office, was not given until 6 January 1942, on the grounds that whilst suspicion of British involvement in the raid was inevitable, what counted was the avoidance of any tangible proof. As a safeguard the Admiralty also dispatched , a , to intercept the vessels at sea, which would provide the cover story that they had been intercepted while trying to make their way home to Europe. Mission SOE agent Richard Lippett had obtained employment with the shipping company John Holt & Co (Liverpool), which had business offices on the island. Having taken up the post he started to make preparations for the raid. He became aware that the crew of Duchessa d'Aosta were in the habit of accepting invitations to parties ashore and had held their own party aboard ship on 6 January 1942. Under the guise of a party-goer Lippett managed to gain information about the readiness of the ship for sea, crew numbers, and the watch arrangements. The raiders left Lagos in their two tugs on the morning of 11 January 1942, and while en route they practised lowering Folbots and boarding ships at sea under the command of Captain Graham Hayes. They approached Santa Isabel harbour and at 23:15 and 23:30 hours on 14 January 1942; both tugs were in position outside of the harbour. Onshore, Lippett had arranged for the officers from Duchessa d'Aosta to be invited to a dinner party; 12 Italian officers as well as two German officers from Likomba attended. The boarding parties assembled on the decks of the two tugs as they entered the harbour. Vulcan, with March-Phillipps and his second in command Appleyard on board, headed for Duchessa d'Aosta. As they approached, a few men could be seen on the after deck of the merchant vessel, but they seemed to take no notice of the tug other than to shine a torch in its direction. At the same time, Folbots under the command of Hayes from Nuneaton, were being paddled towards Likomba and Burundi, which were moored together. Challenged by a watchman on Burundi, they persuaded him with their reply that it was the ship's captain coming back on board. The men from the canoes boarded Burundi and the two man crew on watch jumped overboard. After attaching explosive charges on the anchor chain, the commandos guided Nuneaton alongside Likomba to